Low Energy Effective Action for Horava-Witten Cosmology

Details Low Energy Effective Action for Horava-Witten Cosmology Low Energy Effective Action for Horava-Witten Cosmology

2005-04-11

arxiv.org/abs/hep-th/0504087v1

Phys.Rev. D72 (2005) 024009

Physics

High Energy Physics

High Energy Physics - Theory

11 pages

Scientific paper

10.1103/PhysRevD.72.024009

As a supersymmetric extension of the Randall-Sundrum model, we consider a 5-dimensional Horava-Witten type theory, and derive its low energy effective action. The model we consider is a two-brane system with a bulk scalar field satisfying the BPS condition. We solve the bulk equations of motion using a gradient expansion method, and substitute the solution into the original action to get the 4-dimensional effective action. The resultant effective theory can be casted into the form of Einstein gravity coupled with two scalar fields, one arising from the radion, the degree of freedom of the inter-brane distance, and the other from the bulk scalar field. We also clarify the relation between our analysis and the moduli approximation.

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